The Rockwell hardness testing is a procedure for calculating the hardness of metals and certain plastic materials. The Rockwell hardness test follows the principle of the differential-depth method. 3) Check - Indenter Placement. 1.2 This test method includes requirements for the use of portable Rockwell hardness testing machines that measure Rockwell hardness by the Rockwell hardness test principle and can meet all the requirements of this test method, including the direct and indirect verifications of the testing machine. Even though depending on the application, you may have to use other indenters. Thus, the choice of the indenter is not ideal in the Rockwell hardness test but most of the times carbide ball or diamond are used as the … Procedure A (Section 11) yields the indentation of the specimen remaining 15 s after a given major … 1) Check - Level of Machine should be proper. Sometimes, the steel ball is also used as an indenter. In the Rockwell hardness test, tungsten carbide balls or diamond which is in the shape of the square pyramid are used. Principle of Test The Rockwell test consists of measuring the additional depth to which a carbide ball or Brale ® diamond penetrator is forced by a heavy (major) load beyond the depth of a previously applied light (minor) load (SET point). Working Procedure–Rockwell Hardness Testing Machine. Here, the indenter makes a residual depth called the indent and it is measured. This test method is based on Test Methods E18. 2) Check - Machine should be in unload condition. Rockwell hardness numbers are always quoted with a scale symbol representing the indenter size, load, and dial scale used. The total test force is applied in two stages to eliminate errors caused due to the roughness of the surface and measurement. The minor load is applied first and a SET position is established on the dial gauge or displacement sensor of the 4) Check - Dial’s hands should be stationary. The simplicity of the test is its strength, and the Rockwell hardness scale is relied upon to characterise the metals’ hardness for items such as steel, lead, aluminium, copper, zinc, alloys, iron, and titanium, and specific polymer plastics.